LOL indeed!
That thing looks like a converted piece of labware. If purchased from a commercial labware company the unconverted equipment would run (semi-wild guess) maybe $600. A straight glass tube 1/4" or so in diameter with a little finger tip sized fritted end could run close to $300.
As I said earlier, I got my tube with fritted glass end at an aquarium store in PA 30 years ago for a few bucks. It cost more than the same tube with a porous stone on it, but I figured the stone or the cement holding it on wouldn't hold up and someone here confirmed that concern from personal experience.
Jim H
Received from Lee Studley at 3/23/2019 09:52 PM UTC:
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LOL, I never heard of a "fritted gass bubbler" so I googled and one of the first "hits" ,pun intended.was this:
